WO2015144778A1 - High surface area layered double hydroxides - Google Patents

High surface area layered double hydroxides Download PDF

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Publication number
WO2015144778A1
WO2015144778A1 PCT/EP2015/056444 EP2015056444W WO2015144778A1 WO 2015144778 A1 WO2015144778 A1 WO 2015144778A1 EP 2015056444 W EP2015056444 W EP 2015056444W WO 2015144778 A1 WO2015144778 A1 WO 2015144778A1
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WO
WIPO (PCT)
Prior art keywords
layered double
double hydroxide
solvent
ldh
anion
Prior art date
Application number
PCT/EP2015/056444
Other languages
French (fr)
Inventor
Dermot O'hare
Chunping CHEN
Aunchana WANGRIYA
Anchalee WANGARIYAKAWEE
Original Assignee
Scg Chemicals Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US15/129,137 priority Critical patent/US10040695B2/en
Priority to MX2016012329A priority patent/MX2016012329A/en
Priority to KR1020167029660A priority patent/KR20160139003A/en
Priority to JP2016559183A priority patent/JP6616782B2/en
Application filed by Scg Chemicals Co., Ltd. filed Critical Scg Chemicals Co., Ltd.
Priority to AU2015238366A priority patent/AU2015238366A1/en
Priority to CA2942842A priority patent/CA2942842A1/en
Priority to SG11201607636TA priority patent/SG11201607636TA/en
Priority to EP19162927.8A priority patent/EP3536668A1/en
Priority to BR112016021996A priority patent/BR112016021996A2/en
Priority to EP15719621.3A priority patent/EP3122687B1/en
Priority to EA201691938A priority patent/EA031942B1/en
Publication of WO2015144778A1 publication Critical patent/WO2015144778A1/en
Priority to IL247933A priority patent/IL247933A0/en
Priority to ZA2016/06526A priority patent/ZA201606526B/en
Priority to AU2019201645A priority patent/AU2019201645A1/en

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Definitions

  • the present invention relates to high surface area layered double
  • LDHs 5 hydroxides
  • LDHs Layered double hydroxides
  • WO 99/24139 discloses use of LDHs to separate anions including aromatic and aliphatic anions.
  • LDHs Owing to the relatively high surface charge and hydrophiiic properties of LDHs, the particles or crystallites of conventionally synthesised LDHs are is generally highly aggregated. The result of this is that, when produced, LDHs aggregate to form "stone-like", non-porous bodies with large particle sizes of up to several hundred microns and Sow specific surface area of generally 5 to 15 m 2 /g (as disclosed for example in Wang et al Catal. Today 2011 , 164, 198). Reports by e.g. Adachi-Pagano et al (Chem. Commun. 2000, 91 ) of
  • LDHs relatively high surface area LDHs have specific surface areas no higher than 5 to 120 m 2 /g.
  • LDHs In certain applications (for example adsorbents or catalyst supports), it would also be advantageous to provide LDHs with higher surface areas than currently known. Relatively high surface areas would lead to a greater number 2 of active sites and facilitate mass transport from the surface to bulk.
  • the present invention provides a method of preparing a layered double hydroxide having a specific surface area of at least 125 m 2 /g and having the formula: [M z+ 1- M 'y+ x (OH) 2 (X" " ) a /n i)H 2 0-c(AMO-solvent) (I)
  • M, M', z, y, x, a, b and X are as defined above from a solution containing the cations of the metals M and M' and the anion X" " ;
  • step b) aging the layered double hydroxide precipitate obtained in step a) in the original solution;
  • the layered double hydroxide will typically be produced by adding an aqueous precursor solution containing ions of the metals M and M' into a solution containing the anion X which may additionally contain NaOH or to which NaOH solution may be added separately in order to adjust the pH of the solution to a predetermined value, typically greater than 7, preferably greater than 9, more preferably 0-12. It is, according to a preferred embodiment, desirable to add the metal precursor solution to the anion solution rapidly with vigorous stirring since this promotes rapid nucleation of the LDH. We have found that this rapid addition and quick co-precipitation stage causes the LDH colloid formed to have a smaller and thinner particle size.
  • the LDH is subjected to ageing in the original reaction solution and, preferably, the solution containing the precipitated LDH will be aged for less than 24 hours, preferably less than 16 hours and more preferably less than 3 hours.
  • step c) of the method the precipitated layered double hydroxide is collected and then washed. Typically, the precipitate is collected by filtration. After collection, the precipitate is washed until the washing solution has a pH which is substantially neutral, for example pH 7 ⁇ 0.5. Washing is typically carried out using deionised water. Preferably, after water washing, the precipitated LDH is rinsed with the AMO-solvent.
  • the LDH is re-dispersed in the AMO-solvent so as to produce a slurry of the LDH in the solvent.
  • the AMO-solvent is one that is miscible with water.
  • the AMO-solvent has a solvent polarity (P) in the range of from 3.8 to 9.
  • Solvent polarity (P) is defined based on experimental solubility data reported by Snyder and Kirkland (Snyder, L.R. ; Kirkland, J.J. in Introduction to modern liquid chromatography, 2 nd ed.; John Wiley and Sons: New York, 1979; pp 248-250).
  • any suitable organic solvent may be used but preferably will be one selected from acetone, acetonitrile, dimethylformamide, dimethyl sulphoxide, dioxane, ethanol, methanol, n-propanol, isopropanol or tetrahydrofuran.
  • the organic solvent is acetone.
  • the AMO-solvent comprised in the layered double hydroxide of formula (I) may be the same or different as the AMO-solvent used in the dispersing step.
  • the dispersion of LDH in the organic solvent is maintained preferably for at least three hours, it is preferred that the dispersion is maintained under agitation and/or stirring.
  • Stirring can be carried out using a magnetic stirrer at a stirring speed which is preferably at least 300 rpm and more preferably at least 1000 rpm.
  • a propeller mixer having a peripheral speed of at least 0.5 m/s may, alternatively, be used.
  • This ageing process is essential for obtaining an LDH having high surface area.
  • the surface area of the final product is dependent on the length of time the dispersion of the LDH in the organic solvent is aged.
  • the slurry of LDH in the organic solvent is aged for up to 96 hours, for instance for a period of from 1 to 4 days.
  • the ageing period will be in the range of from 1 to 3 days since we have found that the increase in surface area of the LDH that occurs during ageing after the first 72 hours of ageing is not significant.
  • the dispersion of LDH in the organic solvent will be aged for from 48 to 72 hours.
  • it is beneficial to the final product if, after the dispersion of LDH in organic solvent has been subjected to ageing, the organic solvent is removed and the LDH is re-dispersed in fresh organic solvent. When this re-dispersion of the LDH is carried out, the fresh dispersion of the LDH in fresh organic solvent may be maintained for up to 2 hours.
  • the specific surface area of the final dried product depends on the drying procedure used.
  • the step d) of recovering and drying the LDH comprises filtering the LDH from the organic solvent and then subjecting the collected LDH to drying. Drying may be carried out in an oven, with or without applied vacuum. Typically, oven drying will be carried out at a relatively low temperature which will be dependent on the temperature at which the organic solvent evaporates.
  • the drying step when the AMO solvent is acetone, wi!l be carried out at a temperature in the range of room temperature (20°C) to 60°C. In the preferred embodiment according to which acetone is used as the organic solvent, we have found that an oven temperature of about 60°C may be used to dry the collected LDH.
  • the step d) of the method comprises passing the dispersion of LDH in the organic solvent to a spray drying apparatus and then spray drying the dispersion, typically using an inert atmosphere such as nitrogen, so as to produce a spray dried LDH.
  • the final LDH has a significantly increased surface area compared to an LDH product obtained by fiitering and then oven drying the filtered material. Furthermore, it appears from the results we have obtained that the specific surface area of the final LDH obtained is dependent on the feed rate of the dispersion to the spray dryer and on the inlet and outlet temperatures at the spray dryer.
  • the LDH dispersion in the AMO-solvent is fed into the spray dryer at a feed rate of at least 12 ml/min, more preferably at least 18 ml/min and most preferably about 24 ml/min.
  • M may be a single metal cation or a mixture of different metal cations.
  • M may be selected from g, Ca or n, or transition metal cations such as Fe, Ni, Co, Mn or Cu, and when z is 1 , M may be Li.
  • Preferred M are Mg, Zn, Fe, Ca, Ni, Co, Mn, Cu or a mixture of two or more of these.
  • ' may be a single metal cation or a mixture of different metal cations.
  • M' may be selected from Ai, Ga, Y, In, Fe, Co, Ni, Mn, Cr, Ti, V or La, and when y - 4, M' may be selected from Sn, Ti or Zr or a mixture thereof.
  • the preferred M' is AI.
  • the preferred value of y is 3.
  • z is 2 and M is Ca or Mg or Zn or Fe.
  • the preferred LDHs are g/AI, Ca/Ai, Ni/AI, Cu/AI or Zn/AI.
  • Preferred values of x are 0.2 to 1 , preferably 0.22 to 0.5, more preferably 0.23 to 0.4.
  • halide e.g., chloride
  • X B, C, N, S, P: e.g. carbonate, bicarbonate
  • anionic chromophores for example 4-hydroxy ⁇ 3-10 methoxybenzoic acid, 2-hydroxy-4 methoxybenzophenone-5-sulfonic acid (HMBA), 4-hydroxy- 3-methoxy-cinnamic acid, p-aminobenzoic acid and/or urocanic acid.
  • HMBA 2-hydroxy-4 methoxybenzophenone-5-sulfonic acid
  • 4-hydroxy- 3-methoxy-cinnamic acid 4-hydroxy-aminobenzoic acid and/or urocanic acid.
  • the value of c is greater than zero.
  • the following Examples demonstrate the preparation of LDH compounds wherein c is 0.1 .
  • the present invention further relates to a layered double hydroxide A prepared by a method comprising
  • step b) ageing the layered double hydroxide precipitate obtained in step a) in the original solution;
  • the layered double hydroxide A has a specific surface area of at least 125 m 2 /g.
  • M is Mg, Zn, Fe, Ca, Sn, Ni, Cu, Co, Mn or Cd or a mixture of two or more of these, or when z is 1 , M is Li.
  • M' is Al, Ga, Y, in, Fe, Co, Ni, Mn, Cr, Ti, V, or La, or when y is 4, M is Sn, Ti or Zr or a mixture thereof.
  • M' is Al.
  • the layered double hydroxide A will especially be one selected from Zn/Al, Mg/AI, and Ca/AI, Ni/A!, Cu/AI.
  • the layered double hydroxide is an Mg/AI layered double hydroxide.
  • X is an anion selected from at least one of halide, inorganic oxyanion, anionic surfactants, anionic chromophores, and anionic UV absorbers.
  • inorganic oxyanion include carbonate, bicarbonate, hydrogenphosphate, dihydrogenphosphate, nitrite, borate, nitrate, sulphate or phosphate or a mixture or two or more thereof.
  • the layered double hydroxide A of the invention has a specific surface area of at least 125 m 2 /g, preferably at least 240 m /g.
  • the layered double hydroxide A of the invention preferably has a BET pore volume (N 2 ) of at least 0.5 cc/g, more preferably at least .0 cc/g.
  • the layered double hydroxide A of the invention preferably has a particle size less than 150 ⁇ , more preferably a particle size less than 30 pm.
  • the layered double hydroxide A When the layered double hydroxide A is dried by spray drying in step f), it typically has an agglomerated particle size less than 100 pm, preferably less than 30 ⁇ .
  • the present invention provides a Mg-AI- C0 3 layered double hydroxide having a specific surface area of at least 300 m 2 /g, preferably at least 314 m 2 /g, more preferably at least 330 m 2 /g.
  • the materials according to the invention are particularly suitable to be used for a large variety of applications, for instance as catalysts, catalyst supports, sorbents and coatings.
  • X-ray diffraction (XRD) - XRD patterns were recorded on a PANalytical X'Pert Pro instrument in reflection mode with Cu Ka radiation.
  • TEM Transmission Electron Microscopy
  • SEM Scanning Electron Microscopy
  • BET specific surface areas - BET specific surface areas were 5 measured from the N 2 adsorption and desorption isotherms at 77 K collected from a Quantachrome Autosorb-6B surface area and pore size analyser. Before each measurement, LDH samples were first degassed overnight at 1 10°C.
  • ThermoGravimetric Analysis - TGA's was carried out using a Perkin 10 Elmer TGA7 Thermogravametric Analyser. Approximately 10 mg of sample was heated in a platinum pan in the furnace, initially the temperature was held at 30 °C for 5 minutes and then was increased to 800 °C at a rate of 5 °C per minute. The sample was he!d at 800 °C for five minutes. These data were used to determine both the thermal stability and the H 2 0 and AMO solvent i s content of the materials. Small variations in the H 2 0 and acetone content was observed on repeat measurements.
  • Figure 2 SEM images of Mg 3 Ai-C0 3 LDHs obtained from Example 1 after spray drying
  • Figure 3 XRD pattern of Mg 3 Ai ⁇ C0 3 LDHs obtained from Example 1 25 before drying a) only washed with water, b) dispersed in acetone for 48 hr.
  • FIG. 4 SEM images of Mg 3 AI-C0 3 LDHs obtained from Example 2 after drying by oven
  • FIG. 5 SEM images of Mg 3 A!-C0 3 LDHs obtained from Example 2 after spray drying
  • Example 2 after drying by oven Figure 7 N 2 -sorption isotherm of Mg 3 AI-CO 3 LDHs obtained from Example 2 after spray drying
  • Figure 8 SEM images of Mg 3 AI-C0 3 LDHs obtained from Example 3 after drying by oven
  • Figure 9 SEM images of Mg 3 AI-C03 LDHs obtained from Example 3 after spray drying
  • Figure 11 TEM images of Mg 3 AI-C0 3 LDHs obtained from Example 10 before drying (A) water washed (B) 1000 mL of rinsed acetone
  • Figure 12 N 2 -sorption isotherm of Mg 3 AI-C0 3 LDHs obtained from Example 10 rinsed with acetone of 100 mL, 300 mL and 1000 mL.
  • Figure 13 BET surface area and LDH layers of of Mg 3 AI-CO 3 LDHs obtained from Examplel O rinsed with different amount of acetone.
  • Figure 14 BET surface area and LDH layers of of Mg 3 AI-CO3 LDHs obtained from Examplel O dispersed in acetone for different dispersion time.
  • Figure 15 BET surface area and LDH layers of of g 3 AI-CO3 LDHs obtained from Examplel O dispersed in acetone for different dispersion cycies.
  • Figure 16 N 2 -sorption isotherm of Mg 3 Al-CO 3 LDHs obtained from Example 1 1 dispersed in acetone for 1 h, 2 h and 4 h.
  • Figure 17 BET surface area and LDH layers of of Mg 3 AI-CO 3 LDHs obtained from Examplel 1 dispersed in acetone for different dispersion time.
  • Figure 18 BET surface area and LDH layers of of Mg 3 AI ⁇ C0 3 LDHs obtained from Examplel 1 dispersed in acetone for different dispersion cycies.
  • a metal precursor solution was prepared by dissolving 9.6 g of Mg(N0 3 ) 2 6H 2 O and 4.68 g of AI(N0 3 ) 3 .9H 2 0 in 50 mL deionized water.
  • a base solution was prepared by dissolving 4 g of NaOH and 2.65 g of Na 2 CO 3 in 200 mL of deionized water.
  • the metal precursor solution was added quickly into base solution under visciously stirring. After 30 min, the resulting slurry was collected by filtration and washed thoroughly with water and acetone successiveiy. The washed filter cake was re-dispersed into acetone (200 mL) with stirring at 60°C.
  • the BET surface area and pore volume of the resulting Mg 3- AI-CO 3 LDH are shown in Table 1 .
  • the morphology of the Mg 3- Al-C0 3 before drying is presented in Figure 1.
  • the morphology of the Mg 3 -AI-CO 3 LDH after drying by spray dryer are presented in SEM images in Figure 2.
  • the purity of the obtained Mg3-A!-C0 3 LDH was examined by X-Ray Diffraction as shown in Figure 3.
  • the pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature.
  • the "wet cake” was re-dispersed in 1000 ml acetone for 1 hr.
  • Nio.3Mg 2 .7AI-C0 3 LDH was synthesized by adding 700 mL Ni(N0 3 ) 2 " 6H 2 0 (0.0525 mol) and Mg(NO 3 ) 2 6H 2 O (0.4725 mo! and A!(NO 3 )3 9H 2 O (0.175 mol) solution drop- wise into a 700 ml Na 2 CO 3 (0.35 mol) solution with a drop rate in the range of 0.1 -3.5 ⁇ mol(M + + M + ) ⁇ / ⁇ mol(anion) * min ⁇ .
  • the pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature.
  • the "wet cake” was re-dispersed in 1750 ml acetone for 1 hr.
  • Half of the LDH produced, suspended in acetone was dried by oven at 65°C and the other half was dried by spray drying in a N 2 atmosphere.
  • the pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature.
  • the "wet cake” was re-dispersed in 1750 ml acetone for 1 hr.
  • the pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature.
  • the "wet cake” was re-dispersed in 1750 ml acetone for 1 hr.
  • the BET surface area and pore volume of the resulting [Coo.o75 go.67sAio.25 (OH) 2 ](C0 3 )o.i25 0.4H z O-0.1 (acetone) (Co 0 . 3 Mg 2 . 7 AS-CO 3 LDH) Coo.3-Mg 2 .7-AS-C0 3 LDH are shown in Table 6.
  • the pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature.
  • the "wet cake” was re-dispersed in 1750 ml acetone for 1 hr.
  • the pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature.
  • the "wet cake” was re-dispersed in 1750 ml acetone for 1 hr.
  • the BET surface area and pore volume of the resulting [Mgo.75Alo.25(OH)2](N0 3 )o. 25 O.32H 2 O .12(acetone) (Mg 3 AI-NO 3 LDH) g 3 Ai- N0 3 LDH are shown in Table 8.
  • step 1 rinsed acetone
  • step 2 dispersion time
  • step 3 dispersion cycle
  • the BET surface area and pore volume of the resulting Mg 3 AI-C0 3 LDH in each step are shown in Tables 10-12.
  • the morphology of wet Mg 3 -Al-C0 3 LDH after water washing and 1000 mL of rinsed acetone are comparatively presented in TElvl images in Figure 1 1.
  • N 2 -sorption isotherm of Mg 3 AI-C0 3 LDHs obtained after rinsing with different volumes of acetone were shown in Figure 12.
  • the surface area and LDH layers of Mg 3 AI-C0 3 LDHs after each step were shown in Figure 13-15.
  • Table 10 BET surface area and pore volume of g 3 A!-C0 3 LDHs obtained from Step 1 (Rinsed acetone) in Example 10.
  • step 1 rinsed acetone
  • step 2 dispersion time
  • step 3 dispersion cycle
  • the BET surface area and pore volume of the resulting lv1g 3 A!-C0 3 LDH in each step are shown in Table 13-14.
  • N 2 -sorption isotherm of Mg 3 AI-C0 3 LDHs obtained after rinsing with different dispersion time of acetone were shown in Figure 16.
  • the surface area and LDH layers of Mg 3 AI-C0 3 LDHs after Step 2 and Step 3 were shown in Figure 17-18.

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Abstract

Layered double hydroxides having a high surface area (at least 125 m2/g) and the formula (I) wherein M and M' are different and each is a charged metal cation (and must be present), z = 1 or 2; y = 3 or 4, 0<x<0.9, b is 0 to 10, c = 0 to 10, X is an anion, n is the charge on the anion, and a = z(1-x)+xy-2; AMO-solvent is aqueous miscible organic solvent, may be prepared by a method which comprises a) precipitating a layered double hydroxide having the formula [Mz+ 1- x M' y + x (OH)2]a+(Xn-) a/n 'bH2O wherein M, M', z, y, x, a, b and X are as defined above from a solution containing the cations of the metals M and M' and the anion X n- ; b) ageing the layered double hydroxide precipitate obtained in step a) in the original solution; c) collecting, then washing the layered double hydroxide precipitate; d) dispersing the wet layered double hydroxide in an AMO solvent so as to produce a slurry of the layered double hydroxide in the solvent; e) maintaining the dispersion obtained in step d); and f) recovering and drying the layered double hydroxide. The high surface area products have low particle size and are particularly suitable for use as catalysts, catalyst supports, sorbents and coatings.

Description

HIGH SURFACE AREA LAYERED DOUBLE HYDROXIDES
The present invention relates to high surface area layered double
5 hydroxides (LDHs) and to methods of making them.
Layered double hydroxides (LDHs) are a class of compounds which comprise two metal cations and have a layered structure. A review of LDHs is provided in Structure and Bonding; Vol 1 19, 2005 Layered Double Hydroxides ed. X Duan and D.G. Evans. The hydrota!cites, perhaps the most well-known ϊ θ examples of LDHs, have been studied for many years. LDHs can intercalate anions between the layers of the structure. WO 99/24139 discloses use of LDHs to separate anions including aromatic and aliphatic anions.
Owing to the relatively high surface charge and hydrophiiic properties of LDHs, the particles or crystallites of conventionally synthesised LDHs are is generally highly aggregated. The result of this is that, when produced, LDHs aggregate to form "stone-like", non-porous bodies with large particle sizes of up to several hundred microns and Sow specific surface area of generally 5 to 15 m2/g (as disclosed for example in Wang et al Catal. Today 2011 , 164, 198). Reports by e.g. Adachi-Pagano et al (Chem. Commun. 2000, 91 ) of
20 relatively high surface area LDHs have specific surface areas no higher than 5 to 120 m2/g.
In certain applications (for example adsorbents or catalyst supports), it would also be advantageous to provide LDHs with higher surface areas than currently known. Relatively high surface areas would lead to a greater number 2 of active sites and facilitate mass transport from the surface to bulk.
We have found that high surface area LDHs can be prepared by a simple method in a cost effective way involving fewer operational steps and using smaller quantities of organic solvents compared to other known methods. This simple method will be more amenable to large scale 30 production than previous known methods.
Accordingly, the present invention provides a method of preparing a layered double hydroxide having a specific surface area of at least 125 m2/g and having the formula: [Mz+ 1- M'y+ x(OH)2 (X"")a/n i)H20-c(AMO-solvent) (I)
wherein M and M' are different and each is a charged metal cation (and must be present), z = 1 or 2; y - 3 or 4, 0<x<0.9, b is 0 to 10, c = 0 to 10, X is an anion, n is the charge on the anion, and a = z(7-x)+xy-2; AMO-soivent is aqueous miscible organic solvent,
which method comprises
a) precipitating a layered double hydroxide having the formula
[Mz+i„xM'y+ x(OH)2r+(X"')a/n'foH20
wherein M, M', z, y, x, a, b and X are as defined above from a solution containing the cations of the metals M and M' and the anion X"";
b) aging the layered double hydroxide precipitate obtained in step a) in the original solution;
c) collecting, then washing the layered double hydroxide precipitate;
d) dispersing the wet layered double hydroxide in an AMO solvent so as to produce a slurry of the layered double hydroxide in the solvent;
e) maintaining the dispersion obtained in step d); and
f) recovering and drying the layered double hydroxide.
In step a) of the method of the invention, the layered double hydroxide will typically be produced by adding an aqueous precursor solution containing ions of the metals M and M' into a solution containing the anion X which may additionally contain NaOH or to which NaOH solution may be added separately in order to adjust the pH of the solution to a predetermined value, typically greater than 7, preferably greater than 9, more preferably 0-12. It is, according to a preferred embodiment, desirable to add the metal precursor solution to the anion solution rapidly with vigorous stirring since this promotes rapid nucleation of the LDH. We have found that this rapid addition and quick co-precipitation stage causes the LDH colloid formed to have a smaller and thinner particle size. The LDH is subjected to ageing in the original reaction solution and, preferably, the solution containing the precipitated LDH will be aged for less than 24 hours, preferably less than 16 hours and more preferably less than 3 hours. In step c) of the method, the precipitated layered double hydroxide is collected and then washed. Typically, the precipitate is collected by filtration. After collection, the precipitate is washed until the washing solution has a pH which is substantially neutral, for example pH 7 ± 0.5. Washing is typically carried out using deionised water. Preferably, after water washing, the precipitated LDH is rinsed with the AMO-solvent.
According to the method of the invention, the collected and washed
LDH is re-dispersed in the AMO-solvent so as to produce a slurry of the LDH in the solvent. The AMO-solvent is one that is miscible with water. Preferably, the AMO-solvent has a solvent polarity (P) in the range of from 3.8 to 9. Solvent polarity (P) is defined based on experimental solubility data reported by Snyder and Kirkland (Snyder, L.R. ; Kirkland, J.J. in Introduction to modern liquid chromatography, 2nd ed.; John Wiley and Sons: New York, 1979; pp 248-250). Generally, any suitable organic solvent may be used but preferably will be one selected from acetone, acetonitrile, dimethylformamide, dimethyl sulphoxide, dioxane, ethanol, methanol, n-propanol, isopropanol or tetrahydrofuran. According to a particularly preferred embodiment, the organic solvent is acetone. The AMO-solvent comprised in the layered double hydroxide of formula (I) may be the same or different as the AMO-solvent used in the dispersing step.
The dispersion of LDH in the organic solvent is maintained preferably for at least three hours, it is preferred that the dispersion is maintained under agitation and/or stirring. Stirring can be carried out using a magnetic stirrer at a stirring speed which is preferably at least 300 rpm and more preferably at least 1000 rpm. A propeller mixer having a peripheral speed of at least 0.5 m/s may, alternatively, be used. This ageing process is essential for obtaining an LDH having high surface area. We have found that the surface area of the final product is dependent on the length of time the dispersion of the LDH in the organic solvent is aged. Preferably, the slurry of LDH in the organic solvent is aged for up to 96 hours, for instance for a period of from 1 to 4 days. More preferably, the ageing period will be in the range of from 1 to 3 days since we have found that the increase in surface area of the LDH that occurs during ageing after the first 72 hours of ageing is not significant. Typically, the dispersion of LDH in the organic solvent will be aged for from 48 to 72 hours. We have, further, found that it is beneficial to the final product if, after the dispersion of LDH in organic solvent has been subjected to ageing, the organic solvent is removed and the LDH is re-dispersed in fresh organic solvent. When this re-dispersion of the LDH is carried out, the fresh dispersion of the LDH in fresh organic solvent may be maintained for up to 2 hours.
The aged dispersion of the LDH in organic solvent or, if the LDH has been re-dispersed in fresh organic solvent, the re-dispersion is then subjected to a procedure whereby the LDH may be recovered and dried. We have found that the specific surface area of the final dried product depends on the drying procedure used.
According to one preferred embodiment, the step d) of recovering and drying the LDH comprises filtering the LDH from the organic solvent and then subjecting the collected LDH to drying. Drying may be carried out in an oven, with or without applied vacuum. Typically, oven drying will be carried out at a relatively low temperature which will be dependent on the temperature at which the organic solvent evaporates. Preferably, the drying step, when the AMO solvent is acetone, wi!l be carried out at a temperature in the range of room temperature (20°C) to 60°C. In the preferred embodiment according to which acetone is used as the organic solvent, we have found that an oven temperature of about 60°C may be used to dry the collected LDH. We have found that whereas a product dried overnight in an oven at 60°C has a specific surface area of about 142 m3/g, a similar product dried overnight in an open vessel in a vacuum oven has a specific surface area of 180 m2/g or greater.
According to a different preferred embodiment, the step d) of the method comprises passing the dispersion of LDH in the organic solvent to a spray drying apparatus and then spray drying the dispersion, typically using an inert atmosphere such as nitrogen, so as to produce a spray dried LDH.
We have found that by using a spray drying procedure to obtain a dry
LDH product from the dispersion in AMO-solvent, the final LDH has a significantly increased surface area compared to an LDH product obtained by fiitering and then oven drying the filtered material. Furthermore, it appears from the results we have obtained that the specific surface area of the final LDH obtained is dependent on the feed rate of the dispersion to the spray dryer and on the inlet and outlet temperatures at the spray dryer. In the Examples provided, it is demonstrated that an LDH dispersion in acetone (aged for only one hour), spray dried using a feed rate in a range of 10-15 ml/min, an inlet temperature of 87°C and an outlet temperature of 58°CS gives a final spray dried product having a specific surface area of about 316 m2/g whereas the same dispersion spray dried using a feed rate in a range of 20- 25 ml/min, an inlet temperature of 95°C and an outlet temperature of 57°C gives a final spray dried product having a specific surface area of about 333 m2/g. Thus, according to a preferred embodiment, the LDH dispersion in the AMO-solvent is fed into the spray dryer at a feed rate of at least 12 ml/min, more preferably at least 18 ml/min and most preferably about 24 ml/min.
In the formula (I) given for the LDH, M may be a single metal cation or a mixture of different metal cations. For example, when z is 2, M may be selected from g, Ca or n, or transition metal cations such as Fe, Ni, Co, Mn or Cu, and when z is 1 , M may be Li. Preferred M are Mg, Zn, Fe, Ca, Ni, Co, Mn, Cu or a mixture of two or more of these.
' may be a single metal cation or a mixture of different metal cations.
For example, when y = 3, M' may be selected from Ai, Ga, Y, In, Fe, Co, Ni, Mn, Cr, Ti, V or La, and when y - 4, M' may be selected from Sn, Ti or Zr or a mixture thereof. The preferred M' is AI. The preferred value of y is 3.
Preferably, z is 2 and M is Ca or Mg or Zn or Fe.
The preferred LDHs are g/AI, Ca/Ai, Ni/AI, Cu/AI or Zn/AI.
Preferred values of x are 0.2 to 1 , preferably 0.22 to 0.5, more preferably 0.23 to 0.4.
The anion in the LDH may be any appropriate anion organic or inorganic, for example halide (e.g., chloride), inorganic oxyanions (e.g. XmOn(OH)p cl; m = 1 -5; n = 2-10; p = 0-4, q = 1 -5; X = B, C, N, S, P: e.g. carbonate, bicarbonate, hydrogenphosphate, dihydrogenphosphate, nitrite, borate, nitrate, phosphate, sulphate), anionic surfactants (such as sodium dodecy! sulfate, fatty acid saits or sodium stearate), anionic chromophores, and/or anionic UV absorbers, for example 4-hydroxy~3-10 methoxybenzoic acid, 2-hydroxy-4 methoxybenzophenone-5-sulfonic acid (HMBA), 4-hydroxy- 3-methoxy-cinnamic acid, p-aminobenzoic acid and/or urocanic acid.
According to one embodiment of the invention, the value of c is greater than zero. The following Examples demonstrate the preparation of LDH compounds wherein c is 0.1 .
The present invention further relates to a layered double hydroxide A prepared by a method comprising
a) precipitating a layered double hydroxide B having the formula
[Mz÷i.xM'y+ x(OH)2]a+(X"')a/n '&H20
wherein M and M' are different and each is a charged metal cation, z = 1 or 2; y = 3 or 4; 0<x<0.9, b is 0 to 10, X is an anion, n is the charge on the anion, and a = z(1-x)+xy-2; from a solution containing the cations of the metals M and M' and the anion X"".
b) ageing the layered double hydroxide precipitate obtained in step a) in the original solution;
c) collecting, then washing the layered double hydroxide precipitate;
d) dispersing the wet layered double hydroxide in an AMO-soivent so as to produce a slurry of the layered double hydroxide in the solvent;
e) maintaining the dispersion in step d); and
f) recovering and drying the layered double hydroxide A;
wherein the layered double hydroxide A has a specific surface area of at least 125 m2/g.
Preferably, when z is 2, M is Mg, Zn, Fe, Ca, Sn, Ni, Cu, Co, Mn or Cd or a mixture of two or more of these, or when z is 1 , M is Li. Preferably, when y is 3, M' is Al, Ga, Y, in, Fe, Co, Ni, Mn, Cr, Ti, V, or La, or when y is 4, M is Sn, Ti or Zr or a mixture thereof.
According to a preferred embodiment, M' is Al. The layered double hydroxide A will especially be one selected from Zn/Al, Mg/AI, and Ca/AI, Ni/A!, Cu/AI. Most preferably, the layered double hydroxide is an Mg/AI layered double hydroxide. Typically, X is an anion selected from at least one of halide, inorganic oxyanion, anionic surfactants, anionic chromophores, and anionic UV absorbers. Examples of inorganic oxyanion include carbonate, bicarbonate, hydrogenphosphate, dihydrogenphosphate, nitrite, borate, nitrate, sulphate or phosphate or a mixture or two or more thereof.
The layered double hydroxide A of the invention has a specific surface area of at least 125 m2/g, preferably at least 240 m /g.
The layered double hydroxide A of the invention preferably has a BET pore volume (N2) of at least 0.5 cc/g, more preferably at least .0 cc/g.
The layered double hydroxide A of the invention preferably has a particle size less than 150 μιτη, more preferably a particle size less than 30 pm.
When the layered double hydroxide A is dried by spray drying in step f), it typically has an agglomerated particle size less than 100 pm, preferably less than 30 μιη.
According to a different aspect, the present invention provides a Mg-AI- C03 layered double hydroxide having a specific surface area of at least 300 m2/g, preferably at least 314 m2/g, more preferably at least 330 m2/g.
The materials according to the invention are particularly suitable to be used for a large variety of applications, for instance as catalysts, catalyst supports, sorbents and coatings.
In the following Examples, the characterization methods used were:
X-ray diffraction (XRD) - XRD patterns were recorded on a PANalytical X'Pert Pro instrument in reflection mode with Cu Ka radiation. The accelerating voltage was set at 40 kV with 40 mA current (A = 1.542°) at 0.01°s"J from 1° to 70° with a siit size of ¼ degree.
Transmission Electron Microscopy (TEM) - TEM analysis was performed on JEOL 2100 microscope with an accelerating voltage of 400 kV. Samples were dispersed in ethanol with sonication and then cast onto copper TEM grids coated with lacey carbon film.
Scanning Electron Microscopy (SEM) - SEM analyses were performed on a JEOL JSM 6100 scanning microscope with an accelerating voltage of 20 kV. Powder samples were spread on carbon tape adhered to an SEM stage. Before observation, the samples were sputter coated with a thick Platinum layer to prevent charging and to improve the image quality.
BET specific surface areas - BET specific surface areas were 5 measured from the N2 adsorption and desorption isotherms at 77 K collected from a Quantachrome Autosorb-6B surface area and pore size analyser. Before each measurement, LDH samples were first degassed overnight at 1 10°C.
ThermoGravimetric Analysis - TGA's was carried out using a Perkin 10 Elmer TGA7 Thermogravametric Analyser. Approximately 10 mg of sample was heated in a platinum pan in the furnace, initially the temperature was held at 30 °C for 5 minutes and then was increased to 800 °C at a rate of 5 °C per minute. The sample was he!d at 800 °C for five minutes. These data were used to determine both the thermal stability and the H20 and AMO solvent i s content of the materials. Small variations in the H20 and acetone content was observed on repeat measurements.
Further advantages and features of the subject-matter of the present invention can be taken from the following detailed description taking in conjunction with the drawing, in which:
20 Figure 1 : TEM images of Mg3AI~C03 LDHs obtained from Example 1 before drying
Figure 2 : SEM images of Mg3Ai-C03 LDHs obtained from Example 1 after spray drying
Figure 3: XRD pattern of Mg3Ai~C03 LDHs obtained from Example 1 25 before drying a) only washed with water, b) dispersed in acetone for 48 hr.
Figure 4: SEM images of Mg3AI-C03 LDHs obtained from Example 2 after drying by oven
Figure 5: SEM images of Mg3A!-C03 LDHs obtained from Example 2 after spray drying
30 Figure 6: N2-sorption isotherm of Mg3AI-C03 LDHs obtained from
Example 2 after drying by oven Figure 7: N2-sorption isotherm of Mg3AI-CO3 LDHs obtained from Example 2 after spray drying
Figure 8: SEM images of Mg3AI-C03 LDHs obtained from Example 3 after drying by oven
Figure 9: SEM images of Mg3AI-C03 LDHs obtained from Example 3 after spray drying
Figure 10: N2-sorption isotherm of Mg3AI-SO4 LDHs obtained from Example 9 after drying in vacuum oven
Figure 11 : TEM images of Mg3AI-C03 LDHs obtained from Example 10 before drying (A) water washed (B) 1000 mL of rinsed acetone
Figure 12: N2-sorption isotherm of Mg3AI-C03 LDHs obtained from Example 10 rinsed with acetone of 100 mL, 300 mL and 1000 mL.
Figure 13: BET surface area and LDH layers of of Mg3AI-CO3 LDHs obtained from Examplel O rinsed with different amount of acetone.
Figure 14: BET surface area and LDH layers of of Mg3AI-CO3 LDHs obtained from Examplel O dispersed in acetone for different dispersion time.
Figure 15: BET surface area and LDH layers of of g3AI-CO3 LDHs obtained from Examplel O dispersed in acetone for different dispersion cycies.
Figure 16: N2-sorption isotherm of Mg3Al-CO3 LDHs obtained from Example 1 1 dispersed in acetone for 1 h, 2 h and 4 h.
Figure 17: BET surface area and LDH layers of of Mg3AI-CO3 LDHs obtained from Examplel 1 dispersed in acetone for different dispersion time.
Figure 18: BET surface area and LDH layers of of Mg3AI~C03 LDHs obtained from Examplel 1 dispersed in acetone for different dispersion cycies.
EXAMPLES Example 1
A metal precursor solution was prepared by dissolving 9.6 g of Mg(N03)26H2O and 4.68 g of AI(N03)3.9H20 in 50 mL deionized water. A base solution was prepared by dissolving 4 g of NaOH and 2.65 g of Na2CO3 in 200 mL of deionized water. The metal precursor solution was added quickly into base solution under visciously stirring. After 30 min, the resulting slurry was collected by filtration and washed thoroughly with water and acetone successiveiy. The washed filter cake was re-dispersed into acetone (200 mL) with stirring at 60°C. After 48 h, the acetone in the suspension was removed and fresh acetone (200 mL) was introduced. The obtained new suspension was stirred at room temperature for 2 h. The suspension was filtered to collect the LDH solid which was then washed thoroughly with acetone. The final product iMgo.75Alo.25(OH)2](C03)o. i25"0.4H2O .1 (acetone) = (Mg3AI-C03 LDH) was dried in an oven at 60°C overnight.
The BET surface area and pore volume of the resulting Mg3-AI-CO3 LDH are shown in Table 1 . The morphology of the Mg3-Al-C03 before drying is presented in Figure 1. The morphology of the Mg3-AI-CO3 LDH after drying by spray dryer are presented in SEM images in Figure 2. The purity of the obtained Mg3-A!-C03 LDH was examined by X-Ray Diffraction as shown in Figure 3.
Table 1. BET surface area and pore volume of Mg3-AI-CO3 LDHs obtained from Example 1.
Figure imgf000012_0001
* all the samples dried using spray dryer (the same as below) were conducted in the same conditions, which is using the same outlet temperature of 55 °c
Example 2
[ g0.75Alo.25(OH)2](C03)o. i 25,0.0.1 H2OO.1 (acetone) = Mg3Ai-CO3 LDH was synthesized by adding 200 mL Mg(NO3)26H2O (0.15 mol) and AI(NO3)39H20 (0.05 mol) solution drop-wise into a 200 ml Na2CO3 (0.10 mol) solution with a drop rate in the range of 0.1-3.5 {mol(Mr+ + Mv+)}/{mol(anion)*min}. The pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature. The obtained LDH slurry was filtered and washed with deionized water until a pH = 7 was obtained and then the filtered solid was washed with acetone 500 ml through suction filter funnel. The "wet cake" was re-dispersed in 1000 ml acetone for 1 hr.
Half of the LDH produced, suspended in acetone, was dried by oven at 65°C and the other ha!f was dried by spray drying in a N2 atmosphere. The BET surface area and pore volume of the resulting [ g0.75Aio.25(OH)2l(C03)o.i 25-0. Ι Η2ΟΌ.Ι (acetone) = (Mg3AI-CO3 LDH) grAI- CO3 LDH are shown in Table 2. The morphology of Mg3-AI-CO3 LDH after drying by oven and spray dryer are comparatively presented in SEM images in Figure 4 and 5, respectively. N2-sorption isotherm of Mg3Ai-CO3 LDHs obtained after drying by oven and spray dryer were shown in Figure 6 and 7, respectively.
Table 2. BET surface area and pore volume of Mg3-AI-CO3 LDHs obtained from Example 2.
Figure imgf000013_0001
Example 3
[Mgo.75Alo.25(OH)2](C03)o. i25"0.1 H2O .1 (acetone) = Mg3Ai-CO3 LDH was synthesized by adding 200 mL Mg(NO3)26H2O (0.15 mol) and AI(NO3)39H2O (0.05 moS) solution drop-wise into a 200 mL Na2CO3 (0.10 mol) solution with the drop rate in the range of 0.1-3.5 {mol(M l + M i )}/{mol(anion)*min}. The l l H of the precipitation solution was controlled at 10 using a NaOH solution (4 M). After 30 min. of ageing in original solution, the resulting slurry was filtered and washed with deionized water until a pH = 7 was obtained. The filtered slurry was washed with acetone 500 mL through suction filter funnel followed by dispersion in 500 mL of acetone. After 16 hrs of stirring, the suspension was filtered and introduced fresh acetone (1000 mL) for another 1 hr of stirring. The half of LDH suspended in acetone was dried by oven at 65°C and the other half was dried by spray drying in a N2 atmosphere. The BET surface area and pore volume results of the resulting Mg3-AI-CO3 LDH are shown below in Table 3. The morphology of Mg3~AI~CO3 LDH after drying by oven and spray dryer are comparatively presented in SEM images in Figure 8 and 9, respectively.
Table 3. BET surface area and pore volume of Ιν¾3-ΑΙ-Οθ3 LDHs obtained from Example 3.
Figure imgf000014_0001
Example 4
[Nio.o75Mgo.675Alo.25(OH)2](C03)o.i250.42H20-0.13(ac8tone) = Nio.3Mg2.7AI-C03 LDH was synthesized by adding 700 mL Ni(N03)2 "6H20 (0.0525 mol) and Mg(NO3)26H2O (0.4725 mo!) and A!(NO3)3 9H2O (0.175 mol) solution drop- wise into a 700 ml Na2CO3 (0.35 mol) solution with a drop rate in the range of 0.1 -3.5 {mol(M + + M +)}/{mol(anion)*min}. The pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature. The obtained LDH slurry was filtered and washed with deionized water until a pH = 7 was obtained and then the filtered solid was washed with acetone 3000 ml through suction filter funnel. The "wet cake" was re-dispersed in 1750 ml acetone for 1 hr. Half of the LDH produced, suspended in acetone, was dried by oven at 65°C and the other half was dried by spray drying in a N2 atmosphere. The BET surface area and pore volume of the resulting [Ni0.075Mgo.675AI0.25 (OH)2](C03)o.i 25'0.42H2OO.13(acetone) = (Ni0 3Mg2 7AI-CO3 LDH) Ni0.3-Mg2 7- AI-CO3 LDH are shown in Table 4.
Table 4. BET surface area and pore volume of Ni0 3-Mg2 7-AI-CO3 LDHs obtained from Example 4.
Figure imgf000015_0001
Example 5
[CUo.075Mgo.675Alo.25(OH)2](CO3)o.125 Ό.4Η2ΟΌ.1 (acetone) = Cuo.3Mg2.7AI-CO3 LDH was synthesized by adding 700 mL Cu(N03)26H20 (0.0525 mo!) and Mg(NO3)26H2O (0.4725 mol) and AI(NO3)39H2O (0.175 moi) solution drop- wise into a 700 ml Na2CO3 (0.35 mol) solution with a drop rate in the range of 0.1-3.5 {mol(iv ÷ + M ' )}/{mol(anion)*min}. The pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature. The obtained LDH slurry was filtered and washed with deionized water until a pH = 7 was obtained and then the filtered solid was washed with acetone 3000 ml through suction filter funnel. The "wet cake" was re-dispersed in 1750 ml acetone for 1 hr.
The LDH produced, suspended in acetone, was dried by spray drying in a N2 atmosphere. The BET surface area and pore volume of the resulting [Cuo.o75Mgo.67sAlo.25(OH)2]{C03)o.i25,0.4H2O .1 (acetone) = (Cu0.3Mg2.7Ai-CO3 LDH) Cu0.3-Mg2.7-AI-CO3 LDH are shown in Table 5. Table 5, BET surface area and pore volume of Cuo 3-Mg2 7-Al-C03 LDHs obtained from Example 5.
Figure imgf000016_0001
Example 6
[Coo.o75Mgo.675Alo.25{OH)2](C03)o.i25O.4H2O .1 (acetone) = Coa3Mg2.7A!-C03 LDH was synthesized by adding 700 ml_ Co(N03)26H20 (0.0525 mo!) and Mg(N03)2 6H20 (0.4725 mol) and AI(N03)39H20 (0.175 mol) solution drop- wise into a 700 ml Na2C03 (0.35 mol) solution with a drop rate in the range of 0.1-3.5 {mol(M~+ + ivV" )}/{mol(anion)*min}. The pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature. The obtained LDH slurry was filtered and washed with deionized water until a pH = 7 was obtained and then the filtered solid was washed with acetone 3000 ml through suction filter funnel. The "wet cake" was re-dispersed in 1750 ml acetone for 1 hr.
The LDH produced, suspended in acetone, was dried by spray drying in a N2 atmosphere. The BET surface area and pore volume of the resulting [Coo.o75 go.67sAio.25 (OH)2](C03)o.i25 0.4HzO-0.1 (acetone) = (Co0.3Mg2.7AS-CO3 LDH) Coo.3-Mg2.7-AS-C03 LDH are shown in Table 6.
Table 6. BET surface area and pore volume of Coo,3-Mg2.7-Al-C03 LDHs obtained from Example 6.
Figure imgf000016_0002
Example 7
[CUo.0075N!o.0675Mgo.675Alo.25(OH)2](C03) 0.125 Ο.4Η2ΟΌ.Ι (acetone) - Cu0.03Nia.27 g2.7AI-CO3 LDH was synthesized by adding 700 ml_ Cu(N03)26H20 (0.00525 mol) and Ni(N03)26H20 (0.04725 mol) and Mg(NO3)26H2O (0.4725 mol) and Al(N03)39H20 (0.175 mol) solution drop- wise into a 700 mi Na2C03 (0.35 mol) solution with a drop rate in the range of 0.1 -3.5 {moi(IVP+ + M-v )}/{mol(anion)*min}. The pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature. The obtained LDH slurry was filtered and washed with deionized water until a pH = 7 was obtained and then the filtered solid was washed with acetone 3000 mi through suction filter funnel. The "wet cake" was re-dispersed in 1750 ml acetone for 1 hr.
The LDH produced, suspended in acetone, was dried by spray drying in a N2 atmosphere. The BET surface area and pore volume of the resulting [Cu0,GG75Nio 675Mgo.675Alo.25(OH)2](CO3)o.i 25'0.4H2O .1 (acetone)
(Cuo.o3Nio.27Mg2.7AI-C03 LDH) Cu0.o3-Nio.27-Mg2.7-AI-CO3 LDH are shown in Table 7.
Table 7. BET surface area and pore volume of Cuo,o3-Nio.27-Mg2.7-Ai-CO3 LDHs obtained from Example 7.
Figure imgf000017_0001
Example 8
[Mgo.75Alo.25(OH)2](N03)o.25O.32H2O .12(acetone) = Mg3Al-N03 LDH was synthesized by adding 700 mL Mg(NO3)26H2O (0.525 mol) and ΑΙ{Ν03)3'9Η20 (0.175 mo!) solution drop-wise into a 700 ml NaNO3 (0.35 mol) solution with a drop rate in the range of 0.1-3.5 {mol(M~" + Ml" )}/{mol(anion)*min}. The pH of the precipitation solution was controlled at 10 using a NaOH solution (4M), the resulting slurry was left for 16 hrs at room temperature. The obtained LDH slurry was filtered and washed with deionized water until a pH = 7 was obtained and then the filtered solid was washed with acetone 3000 ml through suction filter funnel. The "wet cake" was re-dispersed in 1750 ml acetone for 1 hr.
The LDH produced, suspended in acetone, was dried by spray drying in a N2 atmosphere. The BET surface area and pore volume of the resulting [Mgo.75Alo.25(OH)2](N03)o.25O.32H2O .12(acetone) = (Mg3AI-NO3 LDH) g3Ai- N03 LDH are shown in Table 8.
Table 8. BET surface area and pore volume of Mg3AI-NO3 LDHs obtained from Example 8.
Figure imgf000018_0001
Example 9
[Mg0 75AI0 25(OH)2l(S04)o 25 Ο.55Η2ΟΌ.13(acetone) = Mg3AI-SO4 LDH was synthesized by adding 20 mL g(S04)2 (0.0375moi) and A!(SO4)3 16H2O (0.0125 mol) solution quickly into a 50 ml solution containing 0.025 mol of Na2S04 and 0.075 mol of NaOH. The resulting slurry was left for 30 min at room temperature. The obtained LDH slurry was filtered and washed with deionized water until a pH = 7 was obtained and then the filtered solid was washed with acetone 500 mL through suction filter funnel. The "wet cake" was re-dispersed in 300 mL acetone for 2 hrs. The slurry was filtered and redispersed in 300 mL acetone for 2 hrs.
The LDH produced was filtrated and dried in vacuum oven for 16 hrs. The BET surface area and pore volume of the resulting [Mgo.75Alo.25(OH)2](SO4)o.25,0.55 H2OO.13(acetone) = (Mg3AI-SO4 LDH) Mg3AI- S04 LDH are shown in Table 9. N2-sorption isotherm of Mg3AI-SO4 LDHs after drying in vacuum oven can be shown in Figure 10.
36 Table 9. BET surface area and pore volume of Mg3Ai~S04 LDHs obtained from Example 9.
Figure imgf000019_0001
Example 10 iMg0.75Alo.25(OH)2](C03)o.25'0.1 H2OO.1 (acetone) = Mg3A!-C03 LDH was synthesized by adding the metal precursor solution (20 mL) of 1.875 M Mg(N03)2'6H20 and 0.625 M ΑΙ(Ν03)3·9Η20 into the 50 mL of 0.5 M Na2C03 solution with a drop rate in the range of 0.1-3.5 mol {mo!( "" 1 + MJ'+)}/{moi(anion)*min}. The pH value was kept at ca. 10.0 by dropwise addition of a 4.0 M NaOH solution. After 30min with stirring at room temperature, the slurry was washed with Dl water until the pH was close to 7 fo!iowing by being rinsed with certain amount of acetone (step 1 : rinsed acetone). The obtained LDH wet cake was dispersed in acetone (300 mL) and stirred at room temperature for certain time (step 2: dispersion time). Then the LDH was filtered and re-dispersed into flesh acetone (300 mL) for dispersion cycle study (step 3: dispersion cycle) or dried in vacuum oven for 6 hrs.
The BET surface area and pore volume of the resulting Mg3AI-C03 LDH in each step are shown in Tables 10-12. The morphology of wet Mg3-Al-C03 LDH after water washing and 1000 mL of rinsed acetone are comparatively presented in TElvl images in Figure 1 1. N2-sorption isotherm of Mg3AI-C03 LDHs obtained after rinsing with different volumes of acetone were shown in Figure 12. The surface area and LDH layers of Mg3AI-C03 LDHs after each step were shown in Figure 13-15. Table 10. BET surface area and pore volume of g3A!-C03 LDHs obtained from Step 1 (Rinsed acetone) in Example 10.
Figure imgf000020_0001
Table 11. BET surface area and pore volume of Mg3A!-C03 LDHs obtained from Step 2 (Dispersion time) in Example 10 (Rinsed acetone: 500
Figure imgf000020_0002
Table 12. BET surface area and pore volume of lvlg3Al-C03 LDHs obtained from Step 3 (Dispersion cycle) in Example 10 (Rinsed acetone: 500 mL, dispersion time: 1 h, 300 mL).
Figure imgf000020_0003
Example 11
[ go.75Alo.25(OH)2](C03)o.250.4 H2OO.1 (acetone) = Mg3AI-C03 LDH was synthesized by adding the metal precursor solution (20 mL) of 1 ,875 M Mg(N03)2'6H20 and 0.625 M ΑΙ(Ν03)3·9Η20 quickly into the 50 mL of 0.5 M Na2C03 solution. The pH value was kept at ca. 10.0 by dropwise addition of a 4.0 M NaOH solution. After 30min with stirring at room temperature, the slurry was washed with Dl water until the pH was close to 7 following by being rinsed with certain amount of acetone (step 1 : rinsed acetone). The obtained LDH wet cake was dispersed in acetone (300 mL) and stirred at room temperature for certain time (step 2: dispersion time). Then the LDH was fiitered and re-dispersed into flesh acetone (300 mL) for dispersion cycle study (step 3: dispersion cycle) or dried in vacuum oven for 16 hrs.
The BET surface area and pore volume of the resulting lv1g3A!-C03 LDH in each step are shown in Table 13-14. N2-sorption isotherm of Mg3AI-C03 LDHs obtained after rinsing with different dispersion time of acetone were shown in Figure 16. The surface area and LDH layers of Mg3AI-C03 LDHs after Step 2 and Step 3 were shown in Figure 17-18.
Table 13. BET surface area and pore volume of Mg3AI-C03 LDHs obtained from Step 2 (Dispersion time) in Example 1 1 (Rinsed acetone: 500 mL).
Figure imgf000021_0001
Table 14. BET surface area and pore vo!ume of Mg3Al-C03 LDHs obtained from Step 3 (Dispersion cycie) in Example 1 1 (Rinsed acetone: 500 mL, dispersion time: 1 h, 300 mL).
Figure imgf000022_0001

Claims

A method of preparing a layered double hydroxide having a specific surface area of at least 125 m2/g and having the formula:
|Mz+ 1- M'y+ (OH)2 (X"")a/n i)H20-c(AMO-solvent) (I) wherein M and M' are different and each is a charged metal cation (and must be present), z = 1 or 2; y = 3 or 4, 0< <0.9, b is 0 to 10, c = 0 to 10, X is an anion, n is the charge on the anion, and a = z( 1-x)+xy-2; AMO-so!vent is aqueous miscible organic solvent,
which method comprises
a) precipitating a layered double hydroxide having the formula
Figure imgf000023_0001
wherein M, M\ z, y, x, a, b and X are as defined above from a solution containing the cations of the metals M and M' and the anion X"";
b) ageing the layered double hydroxide precipitate obtained in step a) in the original solution;
c) collecting, then washing the layered double hydroxide precipitate;
d) dispersing the wet layered double hydroxide in an AMO solvent so as to produce a slurry of the layered double hydroxide in the solvent;
e) maintaining the dispersion obtained in step d); and
f) recovering and drying the layered double hydroxide.
A method according to claim 1 , wherein the AMO solvent is an aqueous miscible organic solvent, preferably having a solvent polarity (P) in the range 3.8 to 9.
A method according to either claim 1 or claim 2, wherein, in formula (I), when z is 2, fvl is Mg, Zn, Fe, Ca, Sn Ni, Cu, Co, Mn or Cd or a mixture of two or more of these, or when z is 1 , M is Li. A method according to any one of claims 1 to 3, wherein, in formula (I), when y is 3, M' is Al, Ga, Y, in, Fe, Co, Ni, Mn, Cr, Ti, V, or La, or when y is 4, M' is Sn, Ti or Zr or a mixture thereof.
A method according to claim 4, wherein M' is Al.
A method according to claim 5, wherein the layered double hydroxide is selected from Zn/AI, Mg/AS, and Ca/AI, Ni/AI, Cu/AI.
A method according to claim 6, wherein the layered double hydroxide is an Mg/AI layered double hydroxide.
A method according to any one of the preceding claims, wherein X is an anion selected from at least one of halide, inorganic oxyanion, anionic surfactants, anionic chromophores, and anionic UV absorbers.
A method according to claim 8, wherein the inorganic oxyanion is carbonate, bicarbonate, hydrogenphosphate, dihydrogenphosphate, nitrite, borate, nitrate, sulphate or phosphate or a mixture of two or more thereof.
A method according to any one of the preceding claims, wherein in step a) the layered double hydroxide precipitate is formed by introducing metal ( ^ + '^) solution to the anion (X"") solution with a drop rate in the range of 0.1 to 3.5 {mol( "+ + M †)}/{mol(anion)*min}.
A method according to any one of the preceding claims, wherein in step a) the layered double hydroxide is precipitated from the cation and anion containing solution which either additionally contains NaOH or to which NaOH solution is added separately to adjust pH of solution to a predetermined value.
12. A method according to any one of the preceding claims, wherein in step b) the layered double hydroxide precipitate is aged in the original solution for less than 24 hours, preferably less than 16 hours, more preferably less than 3 hours.
13. A method according to any of the preceding claims, wherein in step c) the layered double hydroxide is collected by filtration and washed with water until the pH of the washing is substantially neutral and then rinsed with AMO-solvent.
14. A method according to any one of the preceding claims, wherein in step d) the wet layered double hydroxide obtained in step c) is dispersed and maintained in AMO-solvent under stirring.
15. A method according to any one of the preceding claims, wherein in step e) the dispersion obtained in step d) is maintained for up to 96 hours, preferably up to 72 hours, more preferably up to 48 hours. 16. A method according to any of the preceding claims, wherein after step e) the layered double hydroxide is collected as wet form and is dispersed in a fresh volume of the AMO solvent and the dispersion is maintained for at least two hours. 17. A method according to any one of the preceding claims, wherein in step f)> the layered double hydroxide is recovered by filtration and the recovered layered double hydroxide is dried in an oven, preferably in vacuum oven, or by a spray dryer.
18. A method according to any one of claims 1 to 17, wherein in step f), the layered double hydroxide is recovered and dried by subjecting the dispersion of layered double hydroxide in the AIvlO solvent to spray drying under inert atmosphere.
19. A layered double hydroxide A obtainable by a method according to any of the preceding claims.
20. A layered double hydroxide A according to claim 19, wherein the layered double hydroxide A has a specific surface area of at least 240 m2/g.
21 . A layered double hydroxide A according to any one of claims 19 to 20, wherein the layered double hydroxide A has a BET pore volume (N2) of at least 0.5 cc/g.
22. A layered double hydroxide A according to claim 21 , wherein the layered double hydroxide A has a BET pore volume (N2) of at least 1.0 cc/g.
23. A layered double hydroxide A according to any one of claims 19 to 22, wherein the layered double hydroxide A has a particle size less than 150 pm.
24. A layered double hydroxide A according to claim 23, wherein the layered double hydroxide A has a particle size less than 30 μιη.
25. A layered double hydroxide A according to any one of claims 19 to 22, wherein the layered double hydroxide A is dried by spray drying in step f) and has an agglomerated particle size less than 100 pm. A layered double hydroxide A according to claim 25, wherein the layered double hydroxide A is dried by spray drying in step f) and has an agglomerated particle size less than 30 pm.
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